PDF malware analysis — malicious · da37c026dd05d09e

MALICIOUS

PDF

242.7 KB

MD5: 1ba5b037359fb1ce2fd84ba2b734b3df SHA-1: a0a08cec511f816321e558c1d190fe30584e226a SHA-256: da37c026dd05d09eff6cc0c3a8e2cdfb0889cfbc1a9d3fe036c4f034721dcf6a

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF file contains embedded JavaScript and a Flash (SWF) object, both flagged as malicious by ClamAV. The ML classifier also strongly indicates maliciousness. The presence of these components suggests the PDF is designed to exploit vulnerabilities, likely through the embedded SWF, to download and execute additional malicious payloads. The extracted JavaScript object, despite its large size and potential obfuscation, is a key indicator of the exploit's mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

ClamAV: Swf.Exploit.Kit-513 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Swf.Exploit.Kit-513
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`aaa.swf` `82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x321D2	27931 bytes
Detection ClamAV: Swf.Exploit.Kit-513 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `8ac5d0ac7ec3568274602646e758a2267f3b9fc703e85f65636c5bc7e1b2621e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x122	489939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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